 //判断菜单节点是否是末级节点
 export default function leafUtils() {
    const setLeaf = (arr) => {
      if (arr && arr.length > 0) {
        for (let i = 0; i < arr.length; i++) {
          if (arr[i].children && arr[i].children.length > 0) {
            arr[i].open = false;
            setLeaf(arr[i].children);
          } else {
            arr[i].open = true;
          }
        }
      }
      return arr;
    };
    return {
      setLeaf,
    };
   }